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We have developed an efficient photometric technique for identifying youngearly-type galaxy candidates using a combination of photometric redshifts,spectral-type classification, and optical/near-infrared colors. Applying ourtechnique to the GOODS HST/ACS and VLT/ISAAC data we have selected a completeand homogeneous sample of young elliptical candidates among early-type fieldgalaxies. The distribution of structural parameters for these candidates showsthat their selection, which is based on early spectral types, is fullyconsistent with early morphological types. We investigate the evolution oftheir luminosities and colors as a function of redshift and galaxy mass andfind evidence for an increasing starburst mass fraction in these youngearly-type galaxy candidates at higher redshifts, which we interpret in termsof massive field galaxies experiencing more massive/intense starbursts athigher redshifts. Moreover, we find indications for a systematically largeryoung elliptical fraction among sub-L*/2 early-type galaxies compared to theirbrighter counterparts. The total fraction among the field early-type galaxiesincreases with redshift, irrespective of galaxy luminosity. Our results aremost consistent with galaxy formation scenarios in which stars in massiveearly-type field galaxies are assembled earlier than in their low-masscounterparts.

Evidence for the Evolution of Young Early-Type Galaxies in the GOODS/CDF-S Field